Name every part
Write down the stroller, car seat or carrycot and adapter model numbers. Product-family names alone may omit a necessary version or regional distinction.
Use the official chart
Check the manufacturer compatibility chart and the instructions for both connected products. A retailer photo or a community comment is not confirmation of a permitted combination.
Keep use contexts separate
Instructions for travelling in a vehicle differ from stroller use and from a separate sleep product. Follow the applicable manufacturer instructions in each context.